Remember, no matter how "safe" a park or place may be, it's important to always be aware of your surroundings. You may even want to consider a walking buddy.
There's many myths that have been spread around for years in regard to sleep. Hearing the debunking of some of these may be quite a comforting relief to you.
I used to think this would be the best excuse to get out of gym class in school, but apparently science says that you can actually be allergic to exercise.
I'm going to be honest with you I hardly ever go to the gym. And when I do I use only the cable machine things so something like this doesn't happen. Here's a guy with a spotter who drops a bunch of weight on his chest. Scary.